Front Spring Question

[Rockcrusher]

Does anyone know the stock rate and free length for a 5,600 lb GVW SWB F100 4×4?

I did a few rough calculations based on the weight of a similar Dana 44 front axle assembly and I come up with a guesstimate of around 480 lbs/inch with a free length of somewhere in the neighborhood of 18".

Guesses and kinda close is okay but real numbers would be a whole lot better.

[CA180]

if you want real numbers you could calculate it yourself.

http://www.hypercoils.com/TechTips/?TipNO=10

Other than that, i'm of no help.

I hope that didnt come across smart ass, hard to post whats it my head sometimes.

Hope it helps though!

[Rockcrusher]

Thanks CA180 but that's not quite what I'm looking for. Lemme see if I can 'splain it better.

There are a number of companies out there that sell replacement coils but the ones that I have seen still let the front end droop a little . . . like virtually every stock Ford coil sprung 4×4 since 1966. Being the picky guy that I am, I want my truck to set level.

Because I don't know the exact unsprung weight of the front end I can't do the spring calculations so the next best alternative is to find the rate and length of the stock springs. That way I have baseline numbers I can massage. Then I can give those numbers to the spring guy and tell him to "Make these".

Make sense?

[averagef250]

I'm not too familiar with the F-100 4x4's, but I swear I've seen 2" front lift coils that are designed specifically to level a truck. I prefer the front to sit just a hair higher than the rear myself. That usually means level for me with the 500 lbs of tools in the bed dropping the rear a bit and smoothing the ride.